Smoke-consuming furnace



(No Model.) 3 Sheets-Sheet 2. R. WALSH.

SMOKE GONSUMING FURNAGE.

Patented June 11, 1895.

WITNESSES v(No Model.) 3 sheets-sheen s.

R. WALSH. SMOKE GONSUMING PUENAGE. No. 540,805. Patented June 11, 1895.

INVENTOR Qa/Dew @M @a 1N: Nonms armas co., Puma-Urso.. wAsmua'ron. n. c.

Unitario Sterns* arent enten.

ROBERT WALSH, OF Pl'll'lSBURG, PEYN'NYSYLVANIA.

stroke-consu|v||NeV FURNACE.

SPECIFICATION formingpart of Letters Patent No. 540,805, dated June' 11, 1 895.

Application'iilcd June 7,1894. Serial No. 513,779i (No modela`y i i' and useful Improvement in Smoke-Consuming Furnaces, of which the following'is a full, clear, and exact description, reference being had to the accompanying drawings, forming 1o\part of this specification, in 'which- Figure l is a longitudinal vertical section of the furnace-chamber of a boilersetting embodying my invention. Fig. 2 is a horizontal sectional view taken on the line II II of Fig. 1, illustrating the arrangement of the air inlet and heating chambers. Fig. 3 is avertical cross-sectional View taken on the line III III of Fig. 1. Fig. 4 is a similar sectional View taken on the line IV IV of Fig. 1. Fig. 5 is al View similar t0 Fig. 4, illustrating a modified construction. Fig. 6 is a cross-sectional view of a furnace-setting, showing the manner of supporting the arches when the combustionchamber is exceptionally wide. Fig. 7 is a detail View', on an enlarged scale, of my improved skewback. Fig. 8 illustrates the application of the skewback to a series of arches. Fig. 9 is a4 partial vertical section of anupright boiler furnished with a surrounding jacket, forming an air-heating space and a special construction of air-supplied baffle-wall. Fig. 10 is a cross-section of Fig. 9 on the line X X of Fig. 9. f

Like symbols of reference refer to like parts throughout this specification.

My invention consists in an improvement in the construction of the combustion chamber of fuel burning furnaces, having for its object the perfect combustion of all the clef ments of the fuel, tothe combined ends of securing the highest possible results as to heat from the fuel burned and the resultant absence of smoke and other 'objectionable products of combustion, together with certain features of novelty relating to the construction of the baffle wall arches, whereby I am enabled to construct such arches across a very wide space of combustion chamber without the use of supporting piers or other obstructions, thereby giving the entire area for the passage of the gases.

In the drawings I have shown my construction of combustion chamberv as applied to an ordinary tubular boiler, but I am not limited to such construction, as it may with equal such as to admit of the conditions of my improvement being fulfilled.

In a prior patent granted to me February x27, 1894, I have illustrated a construction of furnace having many of the features of my present invention, and it now consists of the Tsame general arrangement of air heating passages and supply ports together with certain novel and valuable additional features of improvement, which I have found in practice to -be of great advantage in the operation of the furnace.

The special object of my present invention is to thoroughly mix the various quantities of -air entering through the openings S so that ytheir temperature shall be as nearly uniform as possible when entering ,the different port's leading to the combustion chamber.

It also consists in a new arrangement of the ports -leading into the baffle Wall; in a prewall, whereby it is sloped upward; in the manner of supporting the partition Wall on jarches over` the bridge wall, andin an adjustable delecting tile for controlling the quantity and direction of the flow of escaping gases. y

A further modified construction of the arches is shown in Fig. 6,'in which I illustrate a novel method of supporting the two inner abutting ends of arches under a battery of Y tal type.

lferred construction of the top of the bridge 'two boilers, thus obviating the necessity of a :fideos Referring now to the drawings: 2 represents the front and back walls of a furnace, the side walls of which are formed of an inner and an outer wall 3 4 forming between them'the passage 5. Beneath the door of the back part of the furnace 0 is a series of fines or passages 7 provided with inlet openings 8 for the admission of air; and for the purpose of permitting the colder currents to mingle with the warmer air, due to some portions of the brickwork being hotter than others, the partitions a a and 3 3 `are provided at intervals with openings b to facilitate such mixture as indicated by the arrows in Fig. 2. These openings may be made of sufficient number to insure free passage of the air, and their number, size, and location will bedecided by the skilled furnace builder.

9 is the combustion chamber, 'below which? are located the grate bars i0 and immedi` ately back of the endsof the bars'is `the hollow bridge wall Il, constructed inlikeman#V ner tothe side walls and communicating with the passages therein and with `the centrall groundpassages 7. 'lhebridgewall is made preferably with an `upwardly and forwardly extending top cforthe purpose of `deliecting the gases of combustion up `againstrtheshell` of the boiler, and it is `supplied along'its top" with the ports `l2 andin front immediately under the Lgrate bars with vthe ports "13, through which `the previously heated air passes to the interior of :the com'bustionj chamber. il

At various heights throughout the combus-L tion chamber are arranged rows of ports Ml commnnicatingwiththeopeningin theside walls, the purpose of whiclris to distribute theheated air thoroughly throughoutthe en-f tire area of the furnace, andto bring'it intoA contact with the tire. The amount offai-r thatlI is admitted into the openings 8 maybefregulated by Stoppers or damperswhich `maybe placed therein, andthe doors in front aresup pliedwith dampers I5 for alike purpose.

In Fig. 3 is illustrated an important feature of my present inventiomshowi-ng the manner of dividing the area abovethe bridge wall and of supporting the partitionwall 2O -by means of the arches 19 `19 and vertical piers 18 thereby providing a considerable space D above the top of the arches and ybelow the tile f which spaceconstitutes a pocket orre-v eeptacle into which thegases of `combustion will escape and where they will receive an additional supply of hot air fromthe ports 14 after passing under the baille wall'21. /In` practice I have found that the gases will un` dergo a reverberatory action in this space, as indicated by the arrows, after which they will' pass out over the hollow `bridge wall ll, receiving a fresh supply of hot air, sufficient to accomplish a perfect nal combustion. In4 the chamberlG is located an adjustable tile 22y bearing at its lower forward'end `against a stop 23 `and resting on an arm 24 secured to the shaft 25, so that when the shaft is rotated the 'bridge wall, or both.

the tile may be raised or lowered to control the draft of the furnace, and to deflect the gases upward.

In Fig. 4 I have illustrated the method in which I introduce currents of previously heated air into the body of the baiiie wall 2t from the wall passages 5. Running through the top of the battle wall, from side to side in communication with the passages 5 is the port 26, having downwardly directed exit ports 27 leading into the chamber 9 directly over the grate bars. This arrangement of ports gives ,a good volume of air and is very easy to construct and effective in operation. The baffle wall also extends upwardly as high as the level of the tile f forming a reverberatory `chamber G similar to the chamber D previously described and in which the gases, first sthrown off from the fuel, circulate as indicated bythe arrows, and receive an admis- `ture otheated airfrom additional ports 14.

It will be understood that the chambers D l and G are alike on each side of the center of 'the boiler, andinthecase of a heating furnace or other similar furnace, where their area is not reduced as bythe boiler, their capacity and effect will be much increased.

In Fig. 5 I have illustrated another manner `of stepping the wall up on the inside which is sometimes necessary Aowing to reduced space and other causes. The eiect is to reduce the lcapa'city `of the reverberatory chamber D but ;in other respectsthe construction and operation are the same.

I havefound in practice that it is frequently necessary.` to construct a combustion chamber :u nder a battery of two ory more boilers and in `suchcases the width between the walls of the lfurnace is so great as to prevent a single arch being sprung across, and I havetherefore designed the supporting skew-back illustrated `i-nFigs. 6, 7, and 8, which may be used either `inthe baffle wall or the division wall above In the center beltween the abutting ends of the arches 19' is rod is firmly supported by attachment to beams 29 resting on the boiler shell or side walls. A circulation of water is maintained within the skew-back by the supply pipe 30 and `exhaust pipe 3l, and both these pipes are 1 preferably embedded in the brickwork for the purpose of protecting them from the action 1 Of heal). 1 tory and leffective in practice, aordinga substantial and durable support for the ends of the arches, allowing unimpeded passage of lthegases, and, as illustrated in Fig. 8 a numlber of arches may be so supported to advantage within a single combustion chamber, theirnumber not beinglimited, and the shape, z size and number of the arches may be deter- This construction is verysatisfacmined by the width of the combustion cham- IOO llO

boiler 3 forming the inn-er Wall, and the' jacket 4 the outer, which may be of sheet metal or brickwork or any other desirable or suitable material. A partition 32 is located centrally on opposite sides of the boiler, eX- tending up to Within a short distance of the top of the air chamber, giving a greatly increased circulation of the air, whichv finally escapes through openings 13 into the ash pit from whence itpasses up through the grate Changes and modifications may be madein its construction by the skilled mechanic Without departing from my'invention, as for in# stance hollow metal or clay pipes may be iu,

troduced into the brickwork, for the air, in place of any of the ordinary passages or ports, and I desire it to be understood that in the broad meaning of the words passage and port I mean to include any and all such means, Where their purpose is to serve as air conductors.

Having described myinvention and in what manner it'is constructed and operated, what I claim, and. desire to securek by Letters Patent, 1s-

1. In a furnace, the combination of a combustion chamber 9, divided transversely by the air supplied arched baffle wall 21, air supply ports 14 and 27 in communication with air passages 5 in the side walls; with the hollow bridge wall 11 having an upwardly and forwardly extending top C, vertical piers 18, arches 19 and partition walls 2O filling the space between the arches 19 and. the top tiles f, the hollow bridge wall` being also 'in communication with air passages 5 in the side walls, and also with floor passages 7, substantially as shown and described.

2. In combination with a furnace, preliminary air heating supply passages in communication with theatmosphere, located beneath the ioor of the furnace, divided by partition vwalls a, a, and 3, 3, inlet openings 8, cross passages b in walls a and 3, such passages b in walls a and b respectively being so located as not to be opposite each other, for the purpose of intermingling the currents of incoming air,

'substantially as shown and described.

In testimony whereof I have hereunto set my hand this 3d day of May, 1894.

ROBERT WALSH. .Witnessesz JOHN L. RALPH, C. M. CLARKE. 

